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Finding the Fourth Proportional to 2,129.64, 3,194.94 and 831.48

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Solution

The fourth proportional to 2,129.64, 3,194.94 and 831.48 is: 1,247.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,129.64 : 3,194.94 = 831.48 : x
  2. Step 2: Convert to fraction form
    2,129.64/3,194.94 = 831.48/x
  3. Step 3: Cross multiply
    2,129.64x = 3,194.94 × 831.48
  4. Step 4: Simplify right side
    2,129.64x = 2,656,528.71
  5. Step 5: Solve for x
    x = 2,656,528.71/2,129.64
  6. Step 6: Final answer
    x = 1,247.41

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.